2169021901 has 2 divisors, whose sum is σ = 2169021902. Its totient is φ = 2169021900.

The previous prime is 2169021871. The next prime is 2169021973. The reversal of 2169021901 is 1091209612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2146468900 + 22553001 = 46330^2 + 4749^2 .

It is a cyclic number.

It is not a de Polignac number, because 2169021901 - 2⁷ = 2169021773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2169021301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084510950 + 1084510951.

It is an arithmetic number, because the mean of its divisors is an integer number (1084510951).

Almost surely, 2^2169021901 is an apocalyptic number.

It is an amenable number.

2169021901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2169021901 is an equidigital number, since it uses as much as digits as its factorization.

2169021901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 2169021901 is about 46572.7592160911. The cubic root of 2169021901 is about 1294.4580452640.

The spelling of 2169021901 in words is "two billion, one hundred sixty-nine million, twenty-one thousand, nine hundred one".